chmod can be used only to modify ACLs, and only when the SMB server and mounted share support ACLs. Changes to the file mode bits are silently discarded.

chown enables you to become the file owner only if the SMB server grants you the take ownership privilege.

Links are not supported.

Symbolic links are not supported.

mknod is not supported. (Only file and directory objects are supported.)

The current smbfs implementation does not support multi-user mounts. Instead, each Unix
user needs to make their own private mount points.

Currently, all access through an smbfs mount point uses the Windows credentials
established by the user that ran the mount command. Normally, permissions on
smbfs mount points should be 0700 to prevent Unix users from using each
others' Windows credentials. See the dirperms option to mount_smbfs(1M) for details regarding
how to control smbfs mount point permissions.

An important implication of this limitation is that system-wide mounts, such as
those made using /etc/vfstab or automount maps are only useful in cases
where access control is not a concern, such as for public read-only
resources.